Camera-shutter.



R. KLEIN & T. BRUEGK.

CAMERA SHUTTER.

APPLICATION FILED DBo.4,1911.

1,122,95@ Patented D60. ,29, 1914.

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CAMERA SHUTTER.

APPLICATION FILED M3011. 1911.

1 ,1 22,950. Patented Dee. 29, 1914.

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75?@ NORA/Ey R. KLElN da T. BRUEOK.

CAMERA SHUTTER.

APPLICATION FILED DBG. 4, 1911,

l ,l 22,95@e A. Patented 1380.29, 1914.

4 SHEETS-SHEET 3.

R. KLEIN & T. BRUEOK.

CAMERA SHUTTBR.

APPLICATION FILED 1320.4, 1911.

Patented Deo. 29, 1914,

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RUDOLPH KLEIN AND rnnonon BnUncK, or nocnnsrnn, New. YORK.

carannasrrnr'ilnn.

Application lled iecember 4, 1911.

To all. whom t may concern.'

Be it known that we, RUDOLPH KLEIN and THEoDoR BRUEGK, of Rochester, inthe county of Monroe and State of New York, have invented a new anduseful Improvement in Camera-Shutters, which improvement is fully setforth in the following specication and shown in the ing drawings.

The present invention relates to camera shutters and an object of thesame is to provide a construction whereby increased speed may beobtained, while at the same time providing for bulb and graduated timeeX- accompanyposures.

Another object of the inventionis to improve the shutter mechanism tosecure f greater ease of action.

Still another object of the invention is to improve the means 'forshifting the 'detainingmember or detent. y

A further object of the invention is to provide an auxiliary retardingdevice which permits a .differentiation between the high f speeds.

A still further object is to improve the retarding mechanism. To theseand other ends the invention consists in certain parts and combinationsof parts all of which will be hereinafter described, the novel featuresbeing pointed out in the appended claims. i

In the drawings: Figure 1 is a front view of a shutter construction inaccordance with the present invention; Fig. 2 is a central verticalsection through the shutter casing with all the parts except portions ofthe shutter mechanism removed; Fig. 3 1s a view with the cover plateremoved, together with the setting dial and the lever controlling theretarding mechanism, the shutter parts being illustrated in normalpositions; Fig. 4 is a View similar to Fig. 3 with the parts in setposition; Fig. 5 is a view similar to Fig. 3 with the controlling leverof the retarding device shown vin one position for instantaneousexposure; Fig. 6 is a detail view illustrating the manner in v'hich theintermediate member coperates with the :latch on the bulb lever toprevent the actuation of the detaining member when 'the shutter is setfor time exposure; Fig. 7

lllustrates the connection between the motor or master member and theintermediate member, and the connection between the motor or mastermember and the shutter Specification of Letters Patent.

Patented Dec. 29, 1914. sriaino. 663,802.

mechanism when positions; Fig. 8 is a detail View illustrating themaster or motor member in set position with its connection to theshutter mechanism; Fig. 9 isa view of the shutter blades, one of theblades being removed; Fig. 10 shows the positions of the parts when theshutter/is open, the detaining member yengaging the intermediate memberand being so located that it may be engaged by the latch on the bulblever; Fig. 11 shows the manner in which the intermediate member is heldout of operation by the lever which controls the retarding mechanism;and Fig. 12 illustrates the manner in which the controlling lever holdsout the'retarding mechanism.

According to this invention there is pro vided a casing comprisingpreferably a ring 1 divided by a partition 2 into two chambersindicatedin the drawing as 3 and 4, the chamber. 3 being closed by amember 5, and the chamber 4 being closed by a cover plate G and the dialplate 7. The partition 2 has an aperture, and a lens barrel 8 projectsfrom the partition about such aperture. The shutter mechanism, in thisinstance, comprises a plurality of blades 9 which are loosely fulcrumedon pins 10 projecting from the partition 2 into the chamber 3 of thecasing, the blades preferably .having lslots 11 in which the pins 10work. For

fthe parts'are in normal a roller or disk 15 the periphery of whichturns on the lens barrel 8.

They operating mechanism for the shutter may comprise a motor or mastermember 16 which, in this instance, swings about an axis or post 17 andis normally held in one direction by a coil spring 18. This motor membermay be adapted to connect directly with the shutter mechanism, thisconnection, in this instance, being such that in one direction of themovement of the master member, the shutter mechanism is not aifected,while, in the other direction of movement of the master member, theopening and the closing of lthe shutter is effected. This lost motioncomiectionunay consist (see in detail Fig. 8) of alato 1Q pivoted at 20and Jafter it has beenl shifted by means of thethis construction, whenthe motor member is shifted to store energy in the spring 18, the latch19 rides over the projection 23 without affecting the vshuttermechanism,

but, upon the return movementof the mo' tor member, the shoulder 21first engages the projection 23 to shift the ring 12 and open theshutter, after which the projection 23 is engaged by the shoulder 22 andthe shutter is pulled closed. In this instance, the shutter is of thetype known commercially as a setting shutter, wherein the motor: onmaster member, after being moved to store energy therein, is helduntib-released by suitable actuating devices, theknaster memberpreferably having a setting arm 25 detachably secured to the post 17 bya screw 26 and extending to the exterior of the shutter case through aslot 27 in the ring 1.

arm 25, thev motor or master member isheld in set position by a detentor detaining member 28 engaging with a shoulder 29 on the motor member.l

Forvthe purpose of moving the detaining member 28 to release the motoror master member, actuating devices are employed comprising preferably abulb .lever 30 piv- -oted at 31 and having its free end 32 coperatingwith a piston 33 operating in a cylinder 34 to which air is delivered bya bulb or other compressor connected to the nipple 35. The bulb levermay also. be. actuated by 'a thumb lever 36 pivoted at 37 and having anactuating end 38 on the exterior of the casing, its other endrcooperating with a projection 39 extending laterally from the bulblever. The detaining member 28 is,`in this instance, rigid with the bulblever, the' spring 40 not only serving to retain the bulb lever incoperation with its pump piston 33 but also acting to hold the detainingmember 28 into coperative relation with the motor or' master member.,`One of the features of this case is the vmember 41 which is preferablyin the form of a double-armed lever pivotedat 42, moving in asmaller arcthan the motor member 16 and having a spring 43 which normally tends tomove the shoulder 44 on said lever into the path of a shoulder 45 on themotor or master member 16.j The member 41 has two functions: it acts toretard the motor or master member, thus'serving as an auxiliaryretarding device; and it serves as an intermediate member between themaster or motor' member 16 .and the detaining devicesv and also betweensaid motor member andthe main retarding device. That it may readilyserve as a retion of the spring 43, to vary its retarding action, iscontrolled preferably by the controlling means of the main retardingdevice, as will be hereinafter pointed out. When interposed'between themotor .member and the detaining devices or the main retarding device,the intermediate member 41 serves to reduce the action of. the strongmotor spring'18 uponl the detaining or retarding devices, thus adding tothe life of the shutter. The detaining means, in this instance,comprises a member 47 pivoted at 48 and tending to move in one directionunder the action of the spring 49, in order to throw a shoulder 50 onthe detaining member into the path ofl a laterally extending-shoulder 51on the member 41 after the latter has moved under the action ofthespring 43 so asto move the shoulder 51 out of engagement with theshoulder 52 on. the detaining member, providing of course the latter islotherwise free to move. It is apparent that the member 41 -in this waycontrols the ac tion of the detaining member and holds the same out ofdetaining position as' long as it lies in the position shown in Fig. 7.

The position of the detaining member 47, when engaging with the shoulder51 to hold the shoulder 44 of the member 41 in the path of lugs 45 ofthe motor member 16 so that the shutter will be heldlopen, is shown inFig. 10. ThisI gure also illus tratesl the manner in which the actuatingdevices coperate with the detaining member, the 'actuating device beingprovided with a dog or latch 53-which may be pivoted at 54 to the bulblever 30 and pressed in one direction by a spring 55. The dog or latchhas a laterally extending shoulder 56y which moves in engagement withthe face 57 on the detaining member 47 toward aV im shoulder 58 on saiddetaining member. Upon the engagement of the shoulder 56 with theshoulder 58 due to the operation of the bulb lever 30 when the shutteris in open position, the member 47 is shifted to move the shoulder 50out of the path of. the shoulder 51 on the intermediatemember 41.

To the'end that the detaining member 47 will not be shifted by the latch53' when the bulb lever 30 is actuated to release the motor member16,'means may be provided for making the latch 53 inoperative duringsuch action of lthebulb lever. This means, in this instance, consists ofan extension 59 on the intermediate member 41 to'engage with theshoulder 56 on the latch 53 and shift the latter so that, during themovementof .the bulb lever to release the motor member 16, the shoulder56 will not engage the shoulder 58, but, after the intermediate memberhas moved into engagement with the detaining member, the extension 59moves out of engagement with the shoulder 56 and permits the latter, onthe nextoperation on the bulb lever, to coperate with the shoulder 58.The position of the extension 59 when cooperating with the shoulder 56is shown'in detail in Fig. 6. l

The position of the detaining member is determined by a controlling body60 which, in this instance, is in the form of a cam rotatable about anaxis 61 and having an operating face extending entirely about the same,the portion 60a of said face coperating with a lateral projection 62 onthe detaining member 47 to determine the position Y that the shoulder 50shall assume to the shoulder 51 on the lever-41 for making time, bulb orinstantaneous exposures, as will be pointed out hereinafter'. The camis, in this instance, operated by the disk rV dial 7 'which has apin orprojection 63 operating in a slot 64 in the cam body 60.

The main retarding device is preferably in the form of a train of wheels65 geared together and'moved in one direction by a spring 66. One of thewheels 65 has a lateral projectionor swinging device 67 adapted tocoperate with anend of one arm of the intermediate member 41 to retardthe movement of the latter and consequently the movement of the motororv master member 16, the `member 41 moving the train of wheels againstthe action of the spring 66 and holding said spring compressed until themember 41 moves under the action of its spring 43 when the train ofgears follows up the member 43 if said train is not otherwise held.

It is apparent that, if the distance which the projection 67 returnsunder the action of thespring 6 6 be varied, the retarding action ofsaid train of gears on the intermediate member 41 and the motor member16 will be varied. For controlling this return action there may beemployed a controlling lever 68 preferably pivoted at 69 between itsends to provide two arms, one of which is formed with a lateral shoulder70 for cooperation with the surface on the cam 60 so that the retardingdevice will be controlled by a single body which also controls thedetaining member. The other arm of the lever 68 is formed at `71 tocoperate with the projection 67y on one of the wheels of the retardingtrain, this end being shifted by the cam to determine the distance theprojection 67 shall travel under the action of the spring 66. The lever68 also varies the action of the auxiliary retarder 41 and to this endmay have a laterally extending shoulder 72 for coperaton with a shoulder73 lon the member 41'. The end 71 of the lever 68 is so formed that whenthe projection 67 is held by the end of the member 41 said end 71 maymove relatively to the projection 67, so that the laterally extendingshoulder 72 will move into engagement with thc'shoulder 73 on the member41 and hold the latter against any movement whatsoever under the actionof spring 43, when the member 16 is shifted to store up energy in themotor spring 18, and in this way the motor member 16 may move to closethe shutter without being affected either by the main or by theauxiliary retarding device.. The lever 68 is held against the cam byv anarm 18a on the spring 18 and by this means the tension of the spring 18is varied as the lever 68 is shifted, thus producing a. variation of thetension in the motor'spring for different speeds.

' Highest speed-The highest speed is. ob-

hand to store energy in the spring 18, the

shoulder' 28 on the bulb lever engages the shoulder 29 on the motormember 16, and connection is established between the latch 19 and theprojection 23 onA the ring 12. Then the bulb lever is actuated, themotor member 16 is released, permitting the full force Vof the spring 18to effect the opening and the closing of the shutter, the shoulder 44 onthe member 41 being entirely out of the path of the shoulder 45 member6.

Auxiliary retardingl-This is eEect-ed by letting the shoulder 44 ofthemember 41 more or less into the path ofthe shoulder 45 of the motormember 16. The controlling lever 68 varies this retarding action byholding the member 41 at any point between the two limits of movement ofsaid member 4l, while at the same time holding the main retarding deviceor train of wheels 65 out of the path of the member 41.

Main retarcing-For still slower speeds, the main retarding device isthrown. into action by the lever 68 which is shifted to the positionshown in Fig. 5 for the slowest speed, and at various positions betweenthe position shown in Fig. 5 and that shownin F ig. 12 for other slowspeeds. lVith this adjustment, the projection 67 follows up the lever41, under the action of the spring 66, upon the setting of the shutter,so that, upon the return movement of the member 41 under the action ofthe motor member 16, the train of wheels retards the action of themember 41 and consequently retards the movement of the motor member 16.y

Time exposure-This is effected by letting the shoulder 50 on thedetaining member 47 move into the path of the projection 51 on theintermediate member 41, and the shoulder 74 on the detaining member moveof the motor taining member- 28 disengages from the f shoulder 29 'on'the 4motormember 16 per- -mitting the motor member to move and shiftthemember 41 until the shoulder 51 on vthe latter engages the shoulder50 on .the detaining member, thus holding the shutter open. UponAthe-next actuation of the bulb lever 30, the shoulder 56 on the latch53 will engage the shoulder 58 on the detaining member because theextension y59 on the member 41 moved out of engagement with the latchwhen the shutter opened. By the engagement of the shoulder 56 with theshoulder 5 8, the detaining'member is kicked out of the path of themember 41 so that the latter may move and permit the motor member toclose the shutter.

I Bulb exposure-For bulb exposure the detaining member does not movesuch a distance that Athe shoulder 74 thereof will be engaged by thelateral shoulder v75 on the bulb lever; otherwise, when the shutter isset, the parts are actuated the same as for time exposure. Upon thepressure of the bulb, after the shutter is set, the shoulder 51 on themember 41 moves into engagement with the shoulder `50 on the detainingmember. Upon the release of the bulb pressure, a lateral shoulder 7 6 onthe bulb lever 30 cooperates with ashoulder 77 on the detaining member47 and kicks the shoulder 50 out of the path of the shoulder 51' on theintermediate member 41, thus permitting the latter to move under theaction of the motor lmember 16.

A camera shutter constructed 1n accordance with this invention is strongand durable in use While giving accuracy and effective speed. Theshutter mechanism is of a simple construction giving ease of action. Themotor member is connected `to the retarding device and the detainingmember through an intermediate member which perv mits a strong motorspring to be employed Without imposing the jar therefrom directly iuponthe detaining member and the retarding device. -This intermediate memberacts 'as an auxiliary retarding device Which provides for a greatervariety of speeds.l

What We claim as our invention and desire to secure by Letters Patentis:

1. In a camera shutter, the combination with a casing' having anapertured partition provided with slots and a lens tube projectingvfronithe partition about the aperture, of aring surrounding the lens tube onone side of the partition, pins extending mechanism therefor comprisinga motor or master member having connection with the shutter mechanismfor operating the same,

an intermediate member arranged in the path of the master member, anddetaining means coperating with said intermediate member'to hold theshutter open.

"3. In a camera shitter, the combination "with a shutter mechanism, vofa swinging motor. Vmember having a lost motion connectionwith a shuttermechanismy tozpermit the motor member to be moved in one directionWithout affecting the shutter mechanism and to eEect the opening and,the closing of the shutter mechanisnr by the movement in-the otherdirection, an

intermediate lever having a portion arranged in the path of the swingingmotor member and movable in a smaller arc than the latter, and detainingmeans coperati-ngj With the intermediate lever to hold the shutter open.

4. In a cameral shutter, thecombination Withv a shutter mechanism, of avswinging motor member having an operating portion, an intermediate levermovablev in a smaller arc than the motor member and having a portionlying in the path 'of the mo-v tor member, a detaining member forholding the motor member after energy has been stored therein, adetaining member `for holding the motor member after energy has beenstored therein, a detaining member for coperation With theintermediate'member for holding the shutter open, and releasing meanscommon to both detaining members having one movement to free the -motormember and another movement to free the intermediate member.

5.111 a camera shutter, the combination With a shutter mechanism, .of amotor member connected to the shutter mechanism to actuate the same by amovement in one dij rection, an intermediate lever arranged in the pathof the motormember, a detaining member for holding the motor member withenergyr stored therein, a detaining member n AWith a shutter mechanism,:ber connected to the ver having a detaining ber the shutter fand toeffect vshutter mechanism by the movement in the member in with ashutter. mechanism,

- ranged in the path member-to be moved in one =out affecting theshutter mechanism and to -leii'ect the opening and closing of theshutter mechanism by the movement in the other direction, a two-armedintermediate lever the motor mem- 6. In a camera shutter,- thecombination of a motor memshutter mechanism to actuate the same by amovement in one di- .rectiom an intermediate member in the path fof. themotor member,

a detaining member cooperating with the intermediate member to hold theshutter open, a bulb lemember for holding 'the motor member with energystored in the latter, and a pivoted latch on the bulb lever forengagement with the lirst named detaining member.

In a camera shutter, with a shutter mechanism,

the combination of a motor memhaving a lost motion connection Withmechanism permitting the motor member to be moved in one directionWithout ail'ecting` the shutter mechanism the opening and closing of theother direction, an intermediatevmember, a spring tending to hold saidintermediate the path of the motor member,

a detaining member for preventing movement of the intermediate member inthe opposite direction, a detainingmember 'for the motor member, a leverto which said last mentioned member is connected, a latch on the leverfor4 shifting the detaining member of the intermediate member, and adevice on the intermediate member holding said latch from actuating saiddetaining member until-the motor device is released.

In a camera shutter, the combination of a motor member having a lostmotion connection with. the shutter mechanism permitting the motor zmember to be moved in one direction Without affecting the shuttermechanism and to effect the opening and closing of the shutter mechanismby the movement in the4 other direction, an intermediate member arof themotor member, detaining means coperating With the intermediate member,and retarding mechanism also coperating with the intermediate member;

.ber having a lost motion connection with the shutter mechanismpermitting the motor direction Witharranged to be engaged by ber,detaining means coperating with one arm of said lever to hold theshutteropen, and retarding means coperating with the other arm of saidlever to retard the movement ofthe motor device.

lO. In a camera with a shutter mechanism, of a motor memshutter, thecombination direction, an intermediate member adapted' to be engaged bythe motor member when the latteriis moving to openv and close theshutter, a spring for moving the intermediate member into the path ofthe motor member, a detaining member cooperating With the tei-mediatemember, and means for holding the intermediate member When the motormember is being moved to store energy in it; ll. In a camera shutter,the combination with a shutter mechanism, of a motor member havingconnection with the shutter mechanism to open and close the shutter, anintermediate member engaged bythe motor member in moving to open andclose the shutter, and a spring-pressed detaining member for lcopeiationwith the intermediate member, normally held by the latter against theaction of its spring.A

l2. In arcamera shutter, the combination with a shutter mechanism, of amotor member having 'connection with the shutter mechanism to open andclose the shutter, an intermediate lever for coperation with the motormember, a spring for moving the incoperating portions on the detainingmem bei' and the intermediate member for preventing the movement of theformer until the latter has moved under the action of its spring.

13. Inl a'camera shutter, the combination with a shutter mechanism, ofan operating mechanism therefor embodying a lever moving in onedirection during the .opening and the closing of the shutter, adetaining member coperating with said lever to hold the shutter open,and actuating devices embodying a pivoted latch for coperating with thedetaining member to shift the latter out of the path of the lever, saidactuating devices having two movements, one to effect the movement ofthe lever to open the shutter and the other to shift the detainingmember, and the lever having a portion cooperating with the latch on thefirst movement to prevent the shifting of the detaining member.

14. In a camera shutter` the combination with a shutter mechanism, of anoperating mechanism therefor embodying a lever movable in one directionduring the opening and closing ofthe shutter, a detaining membercoperating With said lever to-hold the shutter open, actuating devicesembodying a /bulb lever having a latch pivoted thereto for cooperatingwith the detaining member to shift the latter from the path of the rstnamed lever, said bulb lever having two movements, one to eect themovement of 'the first named lever to Aopen the shutter, and the otherto shift the detaining member, the first named lever having a portionfor cooperation with the latch on the first movement to prevent theshifting of the detaining member.

15. In a camera shutter, the combination with a shutter mechanism, of adetaining member adapted to coperate with parts-of the shutter to holdthe shutter open', and a pivoted bulb lever of the shutter having a Vforengaging the detaining m the latter from detaining position.

16. In a camera shutter, the combination with aL shutter mechanism, of adetaining member adapted to coperate with parts :ci the shutter to holdfor holding the shutter open, a bulb lever having two movements, one .toeiiect the opening of the shutter and the other to eilect the closing,said lever hava latch pivoted thereto tor engaging and :shifting thedetaining member'on 'the second movement, and

latch pivoted thereto mbermto shi-ft.

latch engaging the detaining member :on the first movement. l

17. In a camera shutter, the combination with a shutter mechanism, of amotor member having a lost motion connection with the shutter mechanismpermitting the motor member to be moved in one out affecting the shuttermechanism and to eiect the opening and closing of the kshutter mechanismby lthe movement in the other direction, meansfor effecting of saidmotor member to a position where 1t may make such movement, lfor holdingsaid'motor member in such position, a detaining member adapted tocoperate with parts of the shutter to hold said motor memberin anintermediate position to h ld the shutterV open, a bulb lever con'- necd to therst-named detaining means to release the motor member on oneaction of said bulb lever, a latch pivoted to the bulb lever to engagethe second detaining means vand shift the latter to release the motormember on a second actuation of the bulb lever, and'means for en agingsaid latchto 4prevent the `latter shi ing the detaining member until thesecond actuation.

18. In acam'era shutter, the combination with ashutter mechanism, of amotor member movable in .one `direction to open and close the shutter,means for effecting the movement ofthe motor member to a position whereit can make suchxmovei'nent, de-

taining means -for holding it in such, posil v tion, `a sprmgpresseddetaining member for holding the motor memb diate position to hold forcontrolling the action means for preventing .such

-with a shutter mechanism direction with-.

the movement' detaining means l er 1n an intermethe shutter open, and

member until after thejfirst named detaining r`means has been actuated.

19. In a camera shutter, the combination with a motor member, of aretarding dev-ice for the motor member :moved in one direction by saidmember, and a spring for moving the retarding l device inthe oppositedirection, the connection between the retard-` ing device and the motormember being such that theretarding device does not move under theaction ofiits spring until the motor member is moved to store energy insuch motor device. Y Y

20; The combination in a camera shutter .of a lever, and of aretardingdevice embodyling a trainofwheels and a swinging device geared to .saidtraindf wheels and engaged by the lever, the latter remaining inengageion with Lsuch detaining' :ment with the swinging deviceafter it,has

completed its movement to open and close `.the shutter, and a spring formoving the swinging device and the train of wheels as the lever` ismoved in the other direction.

21.v Inapcamera shutter, the combination and a motor member foroperating the shutter mechanism, of -a weighted retarding. lever, `and.a spring for lmoving said lever in the path of the motor` member.

:22. Inra camera shutter, the combination with a shutter mechanism and amotor inem- ;ber for operating the shutterpmechanism, of an auxiliaryretarding device adjustable in the path of lthe lmotor member to varyits `action on the motor member, and a main retarding device adj ustablyconnected to the .auxiliary retarding device to vary the action of themotor member. y

In a camera shutter, the combination with a shutter mechanism and amotor mechanism forjoperating 'the shutter mechanism, of a pivotedmember, a spring acting onthe ivoted member to move the latter in thepath of the' motor member, and a retarding device for said pivotedmember.

24.v In a camera shutter, the combination with a shutter mechanism and amotor mechanism forloperating the shutter mechanism,

two retarding devices for the motor member,'one acting on the motorVmember by means of the'other, the action of both retarding devices.

25. In a camera shutter, the combination with a shutter mechanism, of amotor mechanismsfor operating the shutter mechanism, two adjustableretarding devices for the motori` member, one V.acting through theother, and acommon controlling means for the retarding devices. v v

26. In va camera shutter, the combination with a motor member, of tworetarding deand means for varying j vices, one acting directly on themotor member and the other acting on the first one,

springs tending to move said retarding devices to reta-rding positions,and means for determining the movement of said retarding devices underthe action of the springs.

27. In a camera shutter, the combination with .a shutter mechanism, anda motor member for operating the shutter mechanism, of two retardingdevices, one acting on the other and the latter acting on the motormember, and means for rendering inoperative both ofsaid retardingdevices or the one acting on the other;

28. In a camera shutter, the combination with a shutter mechanism, and amotor member for operating the shutter mechanism, of two retardingdevices, one acting on the other and the latter acting on the motormember, springs for moving said retarding devices into retardingpositions, and a single member coperating With both retarding devicesfor determiningv their movements under the action of the springs.

29. In a camera shutter, the combination with a. motor member, of apivoted lever, a spring for moving said lever in the path of the motormember, a retarding device, a spring for moving said retarding device inthe path of the lever, and a lever having a portion to cooperate withthe retarding device to hold the latter against movement under theaction' of its spring and a portion to cooperate With the first namedlever to hold the same against movement under the action of its spring,said last-named portion being arranged to act only When the retardingdevice has been held against movement.

.30. A photographic shutter having in combination, shutter-blades,exposure-mechanism for actuating the blades to produce an exposure,primary means foryieldingly retarding the movement of theexposuremechanism, said means being adapted to ali'ord a comparativelyslight resistance proportioned to a comparatively short exposuresecondary means for yieidingly retarding the exposure-mechanism, thesecondary means being adapted to afford greater resistances proportionedto the longer graded exposures, and manually-operable means forthrow-ing the secondary and primary retarding-means successively out ofoperation to produce exposures graded in duration from long to short.

3l. A photographic shutter having in combination, shutter-blades,exposure-mechanism for actuating the blades, 'a retarder,connecting-means for operatively connecting the retarder with theexposure-mechanism to retard `the action of the latter, and a controllerfor determining the length of exposure; the controller acting upon boththe retarder and said connecting-means and being adapted, when moved todifferent successive positions, first-to throw the retarder out ofoperative positionand then to throw the connecting-means out ofoperative relation to the exposure-mechanism. h

32. A photographic shutter having 1n combination, shutter-blades,exposure-mechanism for actuating the blades, a retarder,

a connecting-leveradapted to engage the retarder at one point and aportion of the exposure-mechanism at another point to operativelyconnect these parts, and a controller Jfor determining the length ofexposure; the controller acting upon both the retarder and theconnecting-lever and being adapted,

Vwhen moved to 'different successive positions, first to move theretarder out of position to operatively engage the connectinglever, andthen to move the connecting-lever out of position to operatively engagethe exposure-mechanism.

RUDOLPH KLEIN. THEODOR BRUECK. Witnesses:

H. H. SIMMS, A. WHITMORE.

